Combined high-pressure throttle and reducing valve



(No Model.) 2 Sheets-Sheet 1.

a A. W. CASH. COMBINED HIGH PRESSURE THROTTLE AND REDUCING VALVE. No.587,670. Patented Aug. 3,1897.

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INVENTOR ATTORNEYS v (No Model.) E 2 SheetsSheet 2.

A. W. CASH. COMBINED HIGH PRESSURE THROTTLE AND REDUCING VALVE. No.587,670. Patented Aug. 3,1897.

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lNVENTOR UNITED STATES ARTHUR TV, CASH, OF YVORCESTER, MASSACHUSETTS.

PATENT. OFFICE.

COMBINED HIGH-PRESSURE THROTTLE AND REDUCING VALVE.

SPECIFICATION forming part of Letters Patent N 0. 587,670, dated August3, 1897.

Application filed June 20, 1896.

ter, in the county of \Vorcester and State of Massachusetts,haveinvented certain new and useful Improvements in a Combined High-Pressure Throttle and Reducing Valve, of

which the following is a specification.

The objects of my invention are to combine in a single casing ahigh-pressure throttlevalve and a reducing-valve and to improve thestructure of the reducing-valve to enable it to more perfectlycompensate for the varying pressure in the high-pressure reservoir.

In order that my invention may be fully understood, I will firstdescribe the same with reference to the accompanying drawings andafterward point out the novelty with more particularity in the annexedclaims.

In said drawings, Figure 1 is a central sectional elevation of mycombined high-pressure throttle and reducing valve. Fig. 2 is a frontelevation of the same.

1 is the inlet from the high-pressure reservoir, and 2 is a strainerlocated in said inletpassage for excluding any dust or other impuritiesfrom the valvechamber. The inletpassage communicates with the dividedhighpressure ports or passages 3 3 through the ports at and 5.

6 and 6 are the valvcclappers of the puppet throttle-valve, saidvalve-clappers being mounted upon a common valve-stem 7 and seatedagainst valve-seats formed in the ports 4: and 5. The valve-stem 7projects through the packing-boxS and is adj ustably secured toa head 9,in which its outer end is threaded.

1O 10 are toggle-links pivoted to the casing upon abolt 11 and to atoggle-link 12 by means of a pin 13. The toggle-link 12 is pivoted tothe head 9 by means of the bolt 14. By moving the toggle-link 12 eitherforward or backward of the dead-center the puppet throttlevalve will bedrawn outwardly into open position.

The high-pressure ports 3 8 communicate with a common low-pressu re portor chamber 15 through the ports 16 and 16. The port 16 is larger thanthe port 16 forthe purpose which will presently appear, and beneath theport 16 is a removable cap 17 by means of Serial No 596,241. (No model.)

which the reducing-valve can be inserted and removed.

The reducing-valve is of the puppet-valve shape. It comprises thevalve-clappers 18 and 18, mounted upon a common valve-stem,

the clapper 18 being adapted to seat against a valve-seat in the port16, while the clapper 18 seats against a seat in the port 16. Theclappers 18 and 1S are formed of differential area for the purpose ofmore completely compensating for the varying pressure in thehigh-pressure reservoir, as will be more fully explained in connectionwith the description of the operation of the valve, and for theadditional purpose of facilitating the insertion of the valve throughthe opening beneath the valve-seats. 19 is the low-pressure outlet.

Supported above the valve-casing is a diaphragm 25, located in thediaphragm-chamber 26, in communication with the low-pressure chamber15.'

27 is a rod or stem secured to the head 28 of the diaphragm andprojecting down into the low-pressure chamber 15, where it is at tachedto an arm or yoke 29, having a bifurcated lower end 30, which fits uponand engages the valve-stem of the reducing puppetvalve.

and 36 are cndwise engaging toggle-levers, engaging, respectively, thehead 28 of the diaphragm and a suitable bearing 37 of the casing.

38 is a bent arm or crank-arm formed integral with the togglc-levcr 30and extending above the casing.

39 is an adjustable screw-stop adapted to limit the movement of thetoggle-levers in one direction.

40 is a yoke or link engaging the upper end of the bent arm 88 andformed with a perforated collar 11, through which extends a bolt 42.Confined upon the bolt 42 is a fulcrum-head 43, which engages a suitableWhen the throttle-valve is open, the fluid under high pressure will passthrough the ports 3 and 3" into the low-pressure chamber and immediatelyact upon the diaphragm for partially closing the reducing-valve, thepressure upon the larger valve-clapper 18 assisting in this action andthe pressure of the spring 45 tending to regulate the dos ing action.The initial pressure is high, and the excess of pressure on the largervalveclapper 18 tends to hold the valve close to its seat, effecting aWire-drawing of the compressed air. As the pressure in the reservoirgradually weakens, the pressure upon the valve-clapper 18 will bereduced and the valve will be allowed to open to a, larger extent,thereby compensating for the varying pressure. The endwise-engagingtoggle-levers and 36 and the crank-arm 38 materially assist thedifferential valve-clapper's 18 18 in compensating for therapidly-increasing resistance to the diaphragm as it moves outwardly inthe act of closing the valve-clappers against their seats. Sucharrangement of toggles and crank arm also compensates for therapidly-increasing resistance of the spring as it is compressed.

My improved arrangement equalizes the diaphragm strain, which increasesrapidly as the valve closes, and enables me to produce an exceptionallyeffective and regular valve.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. Acombined throttle and reducing valve, having a centralinlet-chamberwith ports on opposite sides thereof and a throttlepuppetvalve cooperating with said ports, a central outlet-chamber, withports on opposite sides thereof and communicating with the aforesaidports, and a reducing puppet-valve cooperating with both of the ports ofthe outletvalve space, whereby the fluid is first directed outwardlyfrom the inlet-chamber and then inwardly to the outlet-chamber.

2. A combinedthrottle and reducing valve having inlet and outletchambers located centrally and in line with each other, ports leadingoutwardly from both sides of the inletchamber and ports communicatingwith aforesaid ports and leading inwardly to both sides of theoutlet-chamber, and throttle and reducing puppet-valves for cooperatingrespectively with the two inlet-ports and the two outlet-ports. j

3. In a combined throttle and reducing valve, the combination of thecentrally-located inlet and outlet chambers, ports extending outwardlyfrom opposite sides of both of said spaces, passages connecting each ofthe inlet-ports with one of the outlet-ports, and

two valves cooperating respectively with the two inlet-ports and withthe two outlet-ports.

4. A combined throttle and reducing valve comprising centrally-locatedinlet and outlet chambers, passages on each side of and overlapping thesame, ports connecting said chambers and passages and throttle andreducing valves cooperating with said ports.

5. A valve-casing having high-pressure inlet 1, low-pressure outlet 19,and divided communicating ports or passages 3, 3 throttleva-lve seats,and reducing-valve seats in said ports or passages, the puppetthrottle-valve 6, 6 and the puppet reducing-valve having differentialvalve-clappers 18, 18, substantially as set forth.

6. The combination in a reducing-valve of a lowpressure chamber, ahighpressure chamber overlapping said low-pressure chamber andcommunicating therewith by a port, a puppet-valve cooperating with saidport, a diaphragm in communication with the lowpressure chamber and abent yoke connected to the diaphragm and the puppet-valve and extendingaround the overlapping portions of the high-pressure chamber.

7. The combination in a reducing-valve, of a low-pressure chamber,high-pressure passages outside of and overlapping the same, andcommunicating therewith by ports, a puppet-valve cooperating with saidports, a controlling-diaphragm in communication with the low-pressurechamber and a bent yoke connecting said diaphragm and puppet-valve andextending around the overlapping portion of the high-pressure chamber.

8. A reducing-valve comprising a valvecasing having two high-pressureports and a low-pressure chamber between said ports and communicatingtherewith,a puppet reduci ngvalve having differential valve-clapperscontrolling the high-pressure ports, a yoke-arm supported in thelow-pressure chamber and having a bifurcated end engaging thepuppetvalve stem between the clappers, a diaphragm in communication withthe low pressure chamber, a bar extending from the yoke-arm andconnecting it with the diaphragm anda spring tending to hold thediaphragm in normal position, as set forth.

9. The combination with the diaphragm of a reducing-valve oftoggle-levers engaging respectively at their outer ends with the saiddiaphragm and with a fixed support the points of engagement beingsubstantially in the line of motion of the diaphragm and a springconnected to one of the toggle-levers and controlling its movement.

10. The combination with the diaphragm of a reducing-valve oftoggle-levers bearing respectively, at their outer ends, against saiddiaphragm and against a fixed support substantially in the line ofmotion of the bearing-point on the diaphragm and a spring connected toone of said levers and controlling the movement of the toggle anddiaphragm. 11. The combination with the diaphragm of a reducing-valve,of the toggle-levers engaging with said diaphragm and with a fixedsupport, the points of engagement being substantially in the line ofmotion of the diaph ragm and the toggle working outward from anearly-locked position to position of in creasing leverage and a springconnected to one of said levers and pressing the toggle toward thelocked position.

12. The combination with the diaphragm of areducing-valve of thetoggle-levers engaging therewith and with a fixed support and workingoutward from a nearly-locked posi- 7 tion to position of increasingleverage, a

spring connected to one of said levers and pressing the toggle towardthe locked posi tion and a stop engaging With the toggle and preventingit from reaching the locked position.

ARTHUR W. CASH.

Vitnesses:

PHILIP W. SOUTHGATE, LoUIs W. SOUTHGATE.

